Get ready to spend upwards of 7000 dollars. I've got around 5 in mine and its not 4wd yet. Getting the axle under the truck is the eaasiest part, then you gotta figure every thing eles out, drive shafts, crossmembers, gears, nismo gears for the rear axle are about 500 for just the ring and pinion and they're all off D44 ratios so its impossiable to get to true ratio match. And the waggy 44 is the easiest and cheapest opption, ford hp 44 wwould be nice but you wwould want to cut it down good bit. Don't buy the calmini through frame shackel mounts, not enough flex, and if not done 100% right they will cause bindage. Not tryin to detere you just get ready to spend some money. Oh and nissannut.com will show you everything you need to know.